Rule, Regula, Pointer and Alidade Images
Alidade Image:
| Date | ca. 1650 |
| Maker | Muḥammad Mahdī |
| Place | Persia |
| Material | Brass |
| Inventory no. | 50122 |
| Acquisition | Purchased from R. S. Clay in 1944 |
Alidade
| Appearance | Tip | Sights | Pinholes | Notches | Description |
|---|---|---|---|---|---|
| Double-ended, replacement. | Simple | Rigid | Single | None | The alidade is remarkably plain. |